const Koa = require('koa')
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')



const index = require('./routes/index')
// const users = require('./routes/users')

//允许跨域
const cors = require('koa2-cors')
app.use(cors({
	origin: function(ctx) {
		if (ctx.url === '/test') {
			return false;
		}
		return '*';
	},
	exposeHeaders: ['WWW-Authenticate', 'Server-Authorization'],
	maxAge: 5,
	credentials: true,
	allowMethods: ['GET', 'POST', 'DELETE'],
	allowHeaders: ['Content-Type', 'Authorization', 'Accept'],
}));

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
	enableTypes: ['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

app.use(views(__dirname + '/views', {
	extension: 'ejs'
}))

// logger
app.use(async (ctx, next) => {
	const start = new Date()
	await next()
	const ms = new Date() - start
	console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

// routes
app.use(index.routes(), index.allowedMethods())
// app.use(users.routes(), users.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
	console.error('server error', err, ctx)
});

module.exports = app